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A292440 as a simple table

n a(n)
0 1
1 -1
2 -1
3 -1
4 -2
5 -4
6 -9
7 -21
8 -51
9 -127
10 -323
11 -835
12 -2188
13 -5798
14 -15511
15 -41835
16 -113634
17 -310572
18 -853467
19 -2356779
20 -6536382
21 -18199284
22 -50852019
23 -142547559
24 -400763223
25 -1129760415
26 -3192727797
27 -9043402501
28 -25669818476
29 -73007772802

[1,-1,-1,-1,-2,-4,-9,-21,-51,-127,-323,-835,-2188,
 -5798,-15511,-41835,-113634,-310572,-853467,
 -2356779,-6536382,-18199284,-50852019,-142547559,
 -400763223,-1129760415,-3192727797,-9043402501,
 -25669818476,-73007772802]

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Last modified February 19 06:46 EST 2018. Contains 299330 sequences. (Running on oeis4.)